$ ./fixpt_harness
[sanity] dc_fixpt_log(2.0) = 0.693147180 (expect ~0.693147181) after 9 iterations
[child] SIGFPE (integer 0/0) trapped after ~21 log iterations
[DF-4883] log(0.0): child exited status=136
[child] SIGFPE (integer 0/0) trapped after ~2 log iterations
[DF-4883] log(-1.0): child exited status=136
RUN_EXIT=0